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Gen William L Shelton, CinC USAF Space Command Speech to U.S. National Space Symposium, 12 Apr 11

Satellite & Data Communication for Air Cadets. “Our dependence [on space] has never been higher. In fact, it’s integrated into how we fight wars today so deeply that it is hard to imagine taking space out of the equation.”. Gen William L Shelton, CinC USAF Space Command

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Gen William L Shelton, CinC USAF Space Command Speech to U.S. National Space Symposium, 12 Apr 11

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  1. Satellite & Data Communication for Air Cadets “Our dependence [on space] has never been higher. In fact, it’s integrated into how we fight wars today so deeply that it is hard to imagine taking space out of the equation.” Gen William L Shelton, CinC USAF Space Command Speech to U.S. National Space Symposium, 12 Apr 11

  2. Unit Aim The aim of this unit is to give learners knowledge of satellite and data communication systems and networks for Air Cadets. CLASSIFICATION UNCLASSIFIED

  3. Unit Introduction This unit gives learners knowledge of satellite and data communication systems and networks that are required at ATC Senior and Master Air Cadet level. This unit introduces the principles and equipment used in satellite and data communication. It explores the types, orbits and roles and construction of satellites, and describes the basic function of a Global Positioning System. The unit also develops an understanding of types of data communications networks and mobile communication.

  4. Learning Outcomes On completion of this unit a learner should: • Know main types and roles of satellites and principles of earth orbit. • Know components and principles of a Global Positioning System • Know principles of data communication • Know types and roles of mobile communication

  5. UK Space Primer

  6. Scope • The Space Environment • Orbits • Launch • The Global Positioning System • The Principles of Data Communication • The Types & Roles of Mobile Communication • Summary • Questions

  7. The Space Environment Reference: Chapter 1; UK Space Primer 7

  8. Space Characteristics • No geographical boundaries • Freedom of movement • Unique characteristics

  9. The Boundary Between Air & Space 150km Spacecraft in orbit 100km Limit of aerodynamic control 80km US Definition 150 100 80 9

  10. The Space Environment An environment characterised by: High energy particles Fluctuating magnetic fields Variable temperatures No aerodynamic forces The laws of orbital motion 10

  11. Key Environmental Regions Magnetosphere Exosphere Thermosphere Mesosphere Ionosphere Space Weather Stratosphere Troposphere Terrestrial Weather 11

  12. Orbits - Definition of Terms

  13. Apogee and Perigee Apogee Furthest point from Earth Perigee Closest point to Earth

  14. Ground Trace A ground trace is the projection of a satellite’s 3D orbit onto the earth’s surface as a 2D representation

  15. Common Orbits ~800-40,000 km 11 HRS 58 MIN ~26,000-8,000 KPH HEO MEO GEO LEO Orbit size determines time for one orbit Orbit size and shape also determines the speed Earth NOT to scale ! 850 km 101 MINUTES 24,600 KPH ~20,830 km 11 HRS 58 MIN ~14,330 KPH ~36,160 km 23 HRS 56 MIN ~11,160 KPH

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